General
Please see [The issue with Plymouth and the Black Screen] to get some background on why this happens for Nvidia based laptops.
Warning: cannot resolve nvidia-utils
You are getting dependency warning when syncing the system
Resolving dependencies...
Warning: cannot resolve "nvidia-utils=550.90.07", a dependency of "linux66-nvidia"
Warning: cannot resolve "nvidia-utils=550.90.07", a dependency of "linux68-nvidia"
Warning: cannot resolve "nvidia-utils=550.90.07", a dependency of "linux69-nvidia"
Error: Failed to prepare transaction:
could not satisfy dependencies:
- unable to satisfy dependency 'nvidia-utils=550.90.07' required by linux66-nvidia
This may happen when you sync a system which uses an [EOL kernel] using pamac or pacman.
There is no longer kernel modules for the unsupported kernel and the dependency resolve fails.
In this example linux68 is unsupported.
resolving dependencies...
warning: cannot resolve "nvidia-utils=550.90.07", a dependency of "linux61-nvidia"
warning: cannot resolve "nvidia-utils=550.90.07", a dependency of "linux66-nvidia"
:: The following packages cannot be upgraded due to unresolvable dependencies:
linux61-nvidia linux66-nvidia
This example should not happen - but if it does - it could be a mirror issue or your metadata (package database) is not current.
sudo pacman-mirrors --continent
sudo pacman -Syu
Option 1
Remove the unsupported kernel
E.g. for linux68
sudo mhwd-kernel -r linux68
Option 2
While system is running the unsupported kernel.
Use mhwd-kenel to move to a supported kernel and in the process remove the unsupported kernel.
E.g. to change to linux66 LTS kernel
sudo mhwd-kernel -i linux66 rmc
Option 3
This is a multistep process when the above is failing for some reason
Remove the video driver using mhwd
sudo mhwd -r pci video-nvidia
sudo pacman -Syu
sudo mhwd -i pci video-nvidia
Option 4
This is more extreme in the approach.
Remove the nvidia-utils package without regards for dependencies
sudo pacman -Rdd nvidia-utils
Then resync your system
sudo pacman -Syu
Finally
Reboot your system